航空发动机成附件振动环境试验剖面确定方法研究

Study on Formulating Method for Vibration Environment Test Profiles of Aero-Engine Accessories

关键词:  航空发动机  振动环境试验  功率谱密度  试验剖面 

Key words:  Aero engine  Vibration environment test  Power spectral density  Test profile

摘要:

针对航空发动机成附件振动环境试验需求,论述了发动机成附件的可靠性试验、功能性试验、耐久性试验以及强化试验的功用与实施流程,明确了各振动环境试验剖面制订中的基本要求。阐述了四类振动环境试验剖面的详细确定步骤、分析方法以及应遵循的基本原则,发展和完善了基于环境测试数据(功率谱密度样本)的振动环境试验剖面确定方法。通过工程实例分析,使读者对试验剖面确定流程形成直观认识,对位于风扇机匣位置的成附件而言,试验剖面的各频段分别用以反映低压转子不平衡激励、高压转子不平衡激励、风扇气动激励以及随机噪声的振动能量。 

Abstract:

The function and implementing process of four sorts of vibration environment tests were discussed according to the development need of aero engine accessories, including reliability test, function test, endurance test and reliability enhancement test . Thus the characteristics of each test profile and basic requirements of test profile formulation were identified. The detailed formulating steps, analytical method and basic principles were expounded. As a result the formulating method for vibration environment test profiles from power density data was developed. Finally, the formulating process was cleared through an engineering case. The power spectral density value of each frequency range in the test profiles represents the vibration energy caused by the unbalance of lower pressure spool, the unbalance of high pressure spool, the aerodynamic force of fan and random noise, respectively. 